try{
rtMaven.run pom: 'pom.xml', goals: '-B clean install '
}catch(e){
    println "test failures?"
}

rtMaven.run pom: 'pom.xml', goals: '-B clean install -Dmaven.test.failure.ignore=true'

if (manager.logContains(".*There are test failures.*")) {
    currentBuild.result = 'UNSTABLE'
}